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Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Quantum walk comb in a dual waveguide quantum cascade laser.

Alessio Cargioli¹, Miguel Montesinos Ballester², Sonja Gantner³

¹Institute for Quantum Electronics, ETH Zurich, Zurich, Switzerland. acargioli@phys.ethz.ch.

Nature Communications

|December 10, 2025

Summary

This summary is machine-generated.

Researchers enhanced quantum cascade lasers (QCLs) for higher power output. Integrating a passive waveguide with a racetrack QCL significantly improved light outcoupling for stable quantum walk comb generation.

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Area of Science:

Quantum optics
Semiconductor lasers

Background:

Ring quantum cascade lasers (QCLs) exhibit stable quantum walk comb formation.
The ring geometry limits high output power applications.

Purpose of the Study:

To improve light outcoupling efficiency in QCLs.
To maintain stable quantum walk comb states at higher power levels.

Main Methods:

Homogeneous integration of a racetrack QCL with a passive waveguide.
Independent design of the passive waveguide for dispersion tuning.

Main Results:

Achieved a 2 orders of magnitude improvement in light outcoupling.
Reached a maximum output power of 120 mW at 253 K.
Demonstrated control over light dispersion via the passive waveguide.

Conclusions:

The racetrack QCL integrated with a passive waveguide overcomes power limitations of ring QCLs.
This design enables tunable dispersion and stable quantum walk comb generation.
Observed ballistic expansion characteristic of quantum walk combs up to 30 cm⁻¹ bandwidth.